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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / net / usb / usbnet.c
blob0182127e6b9d76e998605b98930d4169df7a2df1
1 /*
2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 /*
22 * This is a generic "USB networking" framework that works with several
23 * kinds of full and high speed networking devices: host-to-host cables,
24 * smart usb peripherals, and actual Ethernet adapters.
25 *
26 * These devices usually differ in terms of control protocols (if they
27 * even have one!) and sometimes they define new framing to wrap or batch
28 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
29 * so interface (un)binding, endpoint I/O queues, fault handling, and other
30 * issues can usefully be addressed by this framework.
31 */
32
33 // #define DEBUG // error path messages, extra info
34 // #define VERBOSE // more; success messages
35
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/netdevice.h>
39 #include <linux/etherdevice.h>
40 #include <linux/ctype.h>
41 #include <linux/ethtool.h>
42 #include <linux/workqueue.h>
43 #include <linux/mii.h>
44 #include <linux/usb.h>
45 #include <linux/usb/usbnet.h>
46 #include <linux/slab.h>
47 #include <linux/kernel.h>
48 #include <linux/pm_runtime.h>
49
50 #define DRIVER_VERSION "22-Aug-2005"
51
52
53 /*-------------------------------------------------------------------------*/
54
55 /*
56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
57 * Several dozen bytes of IPv4 data can fit in two such transactions.
58 * One maximum size Ethernet packet takes twenty four of them.
59 * For high speed, each frame comfortably fits almost 36 max size
60 * Ethernet packets (so queues should be bigger).
61 *
62 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
63 * let the USB host controller be busy for 5msec or more before an irq
64 * is required, under load. Jumbograms change the equation.
65 */
66 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
67 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
68 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
69 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
70 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
71
72 // reawaken network queue this soon after stopping; else watchdog barks
73 #define TX_TIMEOUT_JIFFIES (5*HZ)
74
75 // throttle rx/tx briefly after some faults, so khubd might disconnect()
76 // us (it polls at HZ/4 usually) before we report too many false errors.
77 #define THROTTLE_JIFFIES (HZ/8)
78
79 // between wakeups
80 #define UNLINK_TIMEOUT_MS 3
81
82 /*-------------------------------------------------------------------------*/
83
84 // randomly generated ethernet address
85 static u8 node_id [ETH_ALEN];
86
87 static const char driver_name [] = "usbnet";
88
89 /* use ethtool to change the level for any given device */
90 static int msg_level = -1;
91 module_param (msg_level, int, 0);
92 MODULE_PARM_DESC (msg_level, "Override default message level");
93
94 /*-------------------------------------------------------------------------*/
95
96 /* handles CDC Ethernet and many other network "bulk data" interfaces */
97 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
98 {
99 int tmp;
100 struct usb_host_interface *alt = NULL;
101 struct usb_host_endpoint *in = NULL, *out = NULL;
102 struct usb_host_endpoint *status = NULL;
103
104 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
105 unsigned ep;
106
107 in = out = status = NULL;
108 alt = intf->altsetting + tmp;
109
110 /* take the first altsetting with in-bulk + out-bulk;
111 * remember any status endpoint, just in case;
112 * ignore other endpoints and altsetttings.
113 */
114 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
115 struct usb_host_endpoint *e;
116 int intr = 0;
117
118 e = alt->endpoint + ep;
119 switch (e->desc.bmAttributes) {
120 case USB_ENDPOINT_XFER_INT:
121 if (!usb_endpoint_dir_in(&e->desc))
122 continue;
123 intr = 1;
124 /* FALLTHROUGH */
125 case USB_ENDPOINT_XFER_BULK:
126 break;
127 default:
128 continue;
129 }
130 if (usb_endpoint_dir_in(&e->desc)) {
131 if (!intr && !in)
132 in = e;
133 else if (intr && !status)
134 status = e;
135 } else {
136 if (!out)
137 out = e;
138 }
139 }
140 if (in && out)
141 break;
142 }
143 if (!alt || !in || !out)
144 return -EINVAL;
145
146 if (alt->desc.bAlternateSetting != 0 ||
147 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
148 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
149 alt->desc.bAlternateSetting);
150 if (tmp < 0)
151 return tmp;
152 }
153
154 dev->in = usb_rcvbulkpipe (dev->udev,
155 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->out = usb_sndbulkpipe (dev->udev,
157 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
158 dev->status = status;
159 return 0;
160 }
161 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
162
163 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
164 {
165 int tmp, i;
166 unsigned char buf [13];
167
168 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
169 if (tmp != 12) {
170 dev_dbg(&dev->udev->dev,
171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
172 if (tmp >= 0)
173 tmp = -EINVAL;
174 return tmp;
175 }
176 for (i = tmp = 0; i < 6; i++, tmp += 2)
177 dev->net->dev_addr [i] =
178 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
179 return 0;
180 }
181 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
182
183 static void intr_complete (struct urb *urb);
184
185 static int init_status (struct usbnet *dev, struct usb_interface *intf)
186 {
187 char *buf = NULL;
188 unsigned pipe = 0;
189 unsigned maxp;
190 unsigned period;
191
192 if (!dev->driver_info->status)
193 return 0;
194
195 pipe = usb_rcvintpipe (dev->udev,
196 dev->status->desc.bEndpointAddress
197 & USB_ENDPOINT_NUMBER_MASK);
198 maxp = usb_maxpacket (dev->udev, pipe, 0);
199
200 /* avoid 1 msec chatter: min 8 msec poll rate */
201 period = max ((int) dev->status->desc.bInterval,
202 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
203
204 buf = kmalloc (maxp, GFP_KERNEL);
205 if (buf) {
206 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
207 if (!dev->interrupt) {
208 kfree (buf);
209 return -ENOMEM;
210 } else {
211 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
212 buf, maxp, intr_complete, dev, period);
213 dev_dbg(&intf->dev,
214 "status ep%din, %d bytes period %d\n",
215 usb_pipeendpoint(pipe), maxp, period);
216 }
217 }
218 return 0;
219 }
220
221 /* Passes this packet up the stack, updating its accounting.
222 * Some link protocols batch packets, so their rx_fixup paths
223 * can return clones as well as just modify the original skb.
224 */
225 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
226 {
227 int status;
228
229 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
230 skb_queue_tail(&dev->rxq_pause, skb);
231 return;
232 }
233
234 skb->protocol = eth_type_trans (skb, dev->net);
235 dev->net->stats.rx_packets++;
236 dev->net->stats.rx_bytes += skb->len;
237
238 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
239 skb->len + sizeof (struct ethhdr), skb->protocol);
240 memset (skb->cb, 0, sizeof (struct skb_data));
241 status = netif_rx (skb);
242 if (status != NET_RX_SUCCESS)
243 netif_dbg(dev, rx_err, dev->net,
244 "netif_rx status %d\n", status);
245 }
246 EXPORT_SYMBOL_GPL(usbnet_skb_return);
247
248 \f
249 /*-------------------------------------------------------------------------
250 *
251 * Network Device Driver (peer link to "Host Device", from USB host)
252 *
253 *-------------------------------------------------------------------------*/
254
255 int usbnet_change_mtu (struct net_device *net, int new_mtu)
256 {
257 struct usbnet *dev = netdev_priv(net);
258 int ll_mtu = new_mtu + net->hard_header_len;
259 int old_hard_mtu = dev->hard_mtu;
260 int old_rx_urb_size = dev->rx_urb_size;
261
262 if (new_mtu <= 0)
263 return -EINVAL;
264 // no second zero-length packet read wanted after mtu-sized packets
265 if ((ll_mtu % dev->maxpacket) == 0)
266 return -EDOM;
267 net->mtu = new_mtu;
268
269 dev->hard_mtu = net->mtu + net->hard_header_len;
270 if (dev->rx_urb_size == old_hard_mtu) {
271 dev->rx_urb_size = dev->hard_mtu;
272 if (dev->rx_urb_size > old_rx_urb_size)
273 usbnet_unlink_rx_urbs(dev);
274 }
275
276 return 0;
277 }
278 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
279
280 /*-------------------------------------------------------------------------*/
281
282 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
283 * completion callbacks. 2.5 should have fixed those bugs...
284 */
285
286 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
287 {
288 unsigned long flags;
289
290 spin_lock_irqsave(&list->lock, flags);
291 __skb_unlink(skb, list);
292 spin_unlock(&list->lock);
293 spin_lock(&dev->done.lock);
294 __skb_queue_tail(&dev->done, skb);
295 if (dev->done.qlen == 1)
296 tasklet_schedule(&dev->bh);
297 spin_unlock_irqrestore(&dev->done.lock, flags);
298 }
299
300 /* some work can't be done in tasklets, so we use keventd
301 *
302 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
303 * but tasklet_schedule() doesn't. hope the failure is rare.
304 */
305 void usbnet_defer_kevent (struct usbnet *dev, int work)
306 {
307 set_bit (work, &dev->flags);
308 if (!schedule_work (&dev->kevent))
309 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
310 else
311 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
312 }
313 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
314
315 /*-------------------------------------------------------------------------*/
316
317 static void rx_complete (struct urb *urb);
318
319 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
320 {
321 struct sk_buff *skb;
322 struct skb_data *entry;
323 int retval = 0;
324 unsigned long lockflags;
325 size_t size = dev->rx_urb_size;
326
327 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
328 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
329 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
330 usb_free_urb (urb);
331 return -ENOMEM;
332 }
333 skb_reserve (skb, NET_IP_ALIGN);
334
335 entry = (struct skb_data *) skb->cb;
336 entry->urb = urb;
337 entry->dev = dev;
338 entry->state = rx_start;
339 entry->length = 0;
340
341 usb_fill_bulk_urb (urb, dev->udev, dev->in,
342 skb->data, size, rx_complete, skb);
343
344 spin_lock_irqsave (&dev->rxq.lock, lockflags);
345
346 if (netif_running (dev->net) &&
347 netif_device_present (dev->net) &&
348 !test_bit (EVENT_RX_HALT, &dev->flags) &&
349 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
350 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
351 case -EPIPE:
352 usbnet_defer_kevent (dev, EVENT_RX_HALT);
353 break;
354 case -ENOMEM:
355 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
356 break;
357 case -ENODEV:
358 netif_dbg(dev, ifdown, dev->net, "device gone\n");
359 netif_device_detach (dev->net);
360 break;
361 case -EHOSTUNREACH:
362 retval = -ENOLINK;
363 break;
364 default:
365 netif_dbg(dev, rx_err, dev->net,
366 "rx submit, %d\n", retval);
367 tasklet_schedule (&dev->bh);
368 break;
369 case 0:
370 __skb_queue_tail (&dev->rxq, skb);
371 }
372 } else {
373 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
374 retval = -ENOLINK;
375 }
376 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
377 if (retval) {
378 dev_kfree_skb_any (skb);
379 usb_free_urb (urb);
380 }
381 return retval;
382 }
383
384
385 /*-------------------------------------------------------------------------*/
386
387 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
388 {
389 if (dev->driver_info->rx_fixup &&
390 !dev->driver_info->rx_fixup (dev, skb))
391 goto error;
392 // else network stack removes extra byte if we forced a short packet
393
394 if (skb->len)
395 usbnet_skb_return (dev, skb);
396 else {
397 netif_dbg(dev, rx_err, dev->net, "drop\n");
398 error:
399 dev->net->stats.rx_errors++;
400 skb_queue_tail (&dev->done, skb);
401 }
402 }
403
404 /*-------------------------------------------------------------------------*/
405
406 static void rx_complete (struct urb *urb)
407 {
408 struct sk_buff *skb = (struct sk_buff *) urb->context;
409 struct skb_data *entry = (struct skb_data *) skb->cb;
410 struct usbnet *dev = entry->dev;
411 int urb_status = urb->status;
412
413 skb_put (skb, urb->actual_length);
414 entry->state = rx_done;
415 entry->urb = NULL;
416
417 switch (urb_status) {
418 /* success */
419 case 0:
420 if (skb->len < dev->net->hard_header_len) {
421 entry->state = rx_cleanup;
422 dev->net->stats.rx_errors++;
423 dev->net->stats.rx_length_errors++;
424 netif_dbg(dev, rx_err, dev->net,
425 "rx length %d\n", skb->len);
426 }
427 break;
428
429 /* stalls need manual reset. this is rare ... except that
430 * when going through USB 2.0 TTs, unplug appears this way.
431 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
432 * storm, recovering as needed.
433 */
434 case -EPIPE:
435 dev->net->stats.rx_errors++;
436 usbnet_defer_kevent (dev, EVENT_RX_HALT);
437 // FALLTHROUGH
438
439 /* software-driven interface shutdown */
440 case -ECONNRESET: /* async unlink */
441 case -ESHUTDOWN: /* hardware gone */
442 netif_dbg(dev, ifdown, dev->net,
443 "rx shutdown, code %d\n", urb_status);
444 goto block;
445
446 /* we get controller i/o faults during khubd disconnect() delays.
447 * throttle down resubmits, to avoid log floods; just temporarily,
448 * so we still recover when the fault isn't a khubd delay.
449 */
450 case -EPROTO:
451 case -ETIME:
452 case -EILSEQ:
453 dev->net->stats.rx_errors++;
454 if (!timer_pending (&dev->delay)) {
455 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
456 netif_dbg(dev, link, dev->net,
457 "rx throttle %d\n", urb_status);
458 }
459 block:
460 entry->state = rx_cleanup;
461 entry->urb = urb;
462 urb = NULL;
463 break;
464
465 /* data overrun ... flush fifo? */
466 case -EOVERFLOW:
467 dev->net->stats.rx_over_errors++;
468 // FALLTHROUGH
469
470 default:
471 entry->state = rx_cleanup;
472 dev->net->stats.rx_errors++;
473 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
474 break;
475 }
476
477 defer_bh(dev, skb, &dev->rxq);
478
479 if (urb) {
480 if (netif_running (dev->net) &&
481 !test_bit (EVENT_RX_HALT, &dev->flags)) {
482 rx_submit (dev, urb, GFP_ATOMIC);
483 return;
484 }
485 usb_free_urb (urb);
486 }
487 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
488 }
489
490 static void intr_complete (struct urb *urb)
491 {
492 struct usbnet *dev = urb->context;
493 int status = urb->status;
494
495 switch (status) {
496 /* success */
497 case 0:
498 dev->driver_info->status(dev, urb);
499 break;
500
501 /* software-driven interface shutdown */
502 case -ENOENT: /* urb killed */
503 case -ESHUTDOWN: /* hardware gone */
504 netif_dbg(dev, ifdown, dev->net,
505 "intr shutdown, code %d\n", status);
506 return;
507
508 /* NOTE: not throttling like RX/TX, since this endpoint
509 * already polls infrequently
510 */
511 default:
512 netdev_dbg(dev->net, "intr status %d\n", status);
513 break;
514 }
515
516 if (!netif_running (dev->net))
517 return;
518
519 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
520 status = usb_submit_urb (urb, GFP_ATOMIC);
521 if (status != 0)
522 netif_err(dev, timer, dev->net,
523 "intr resubmit --> %d\n", status);
524 }
525
526 /*-------------------------------------------------------------------------*/
527 void usbnet_pause_rx(struct usbnet *dev)
528 {
529 set_bit(EVENT_RX_PAUSED, &dev->flags);
530
531 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
532 }
533 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
534
535 void usbnet_resume_rx(struct usbnet *dev)
536 {
537 struct sk_buff *skb;
538 int num = 0;
539
540 clear_bit(EVENT_RX_PAUSED, &dev->flags);
541
542 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
543 usbnet_skb_return(dev, skb);
544 num++;
545 }
546
547 tasklet_schedule(&dev->bh);
548
549 netif_dbg(dev, rx_status, dev->net,
550 "paused rx queue disabled, %d skbs requeued\n", num);
551 }
552 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
553
554 void usbnet_purge_paused_rxq(struct usbnet *dev)
555 {
556 skb_queue_purge(&dev->rxq_pause);
557 }
558 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
559
560 /*-------------------------------------------------------------------------*/
561
562 // unlink pending rx/tx; completion handlers do all other cleanup
563
564 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
565 {
566 unsigned long flags;
567 struct sk_buff *skb, *skbnext;
568 int count = 0;
569
570 spin_lock_irqsave (&q->lock, flags);
571 skb_queue_walk_safe(q, skb, skbnext) {
572 struct skb_data *entry;
573 struct urb *urb;
574 int retval;
575
576 entry = (struct skb_data *) skb->cb;
577 urb = entry->urb;
578
579 // during some PM-driven resume scenarios,
580 // these (async) unlinks complete immediately
581 retval = usb_unlink_urb (urb);
582 if (retval != -EINPROGRESS && retval != 0)
583 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
584 else
585 count++;
586 }
587 spin_unlock_irqrestore (&q->lock, flags);
588 return count;
589 }
590
591 // Flush all pending rx urbs
592 // minidrivers may need to do this when the MTU changes
593
594 void usbnet_unlink_rx_urbs(struct usbnet *dev)
595 {
596 if (netif_running(dev->net)) {
597 (void) unlink_urbs (dev, &dev->rxq);
598 tasklet_schedule(&dev->bh);
599 }
600 }
601 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
602
603 /*-------------------------------------------------------------------------*/
604
605 // precondition: never called in_interrupt
606 static void usbnet_terminate_urbs(struct usbnet *dev)
607 {
608 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
609 DECLARE_WAITQUEUE(wait, current);
610 int temp;
611
612 /* ensure there are no more active urbs */
613 add_wait_queue(&unlink_wakeup, &wait);
614 set_current_state(TASK_UNINTERRUPTIBLE);
615 dev->wait = &unlink_wakeup;
616 temp = unlink_urbs(dev, &dev->txq) +
617 unlink_urbs(dev, &dev->rxq);
618
619 /* maybe wait for deletions to finish. */
620 while (!skb_queue_empty(&dev->rxq)
621 && !skb_queue_empty(&dev->txq)
622 && !skb_queue_empty(&dev->done)) {
623 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
624 set_current_state(TASK_UNINTERRUPTIBLE);
625 netif_dbg(dev, ifdown, dev->net,
626 "waited for %d urb completions\n", temp);
627 }
628 set_current_state(TASK_RUNNING);
629 dev->wait = NULL;
630 remove_wait_queue(&unlink_wakeup, &wait);
631 }
632
633 int usbnet_stop (struct net_device *net)
634 {
635 struct usbnet *dev = netdev_priv(net);
636 struct driver_info *info = dev->driver_info;
637 int retval;
638
639 netif_stop_queue (net);
640
641 netif_info(dev, ifdown, dev->net,
642 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
643 net->stats.rx_packets, net->stats.tx_packets,
644 net->stats.rx_errors, net->stats.tx_errors);
645
646 /* allow minidriver to stop correctly (wireless devices to turn off
647 * radio etc) */
648 if (info->stop) {
649 retval = info->stop(dev);
650 if (retval < 0)
651 netif_info(dev, ifdown, dev->net,
652 "stop fail (%d) usbnet usb-%s-%s, %s\n",
653 retval,
654 dev->udev->bus->bus_name, dev->udev->devpath,
655 info->description);
656 }
657
658 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
659 usbnet_terminate_urbs(dev);
660
661 usb_kill_urb(dev->interrupt);
662
663 usbnet_purge_paused_rxq(dev);
664
665 /* deferred work (task, timer, softirq) must also stop.
666 * can't flush_scheduled_work() until we drop rtnl (later),
667 * else workers could deadlock; so make workers a NOP.
668 */
669 dev->flags = 0;
670 del_timer_sync (&dev->delay);
671 tasklet_kill (&dev->bh);
672 if (info->manage_power)
673 info->manage_power(dev, 0);
674 else
675 usb_autopm_put_interface(dev->intf);
676
677 return 0;
678 }
679 EXPORT_SYMBOL_GPL(usbnet_stop);
680
681 /*-------------------------------------------------------------------------*/
682
683 // posts reads, and enables write queuing
684
685 // precondition: never called in_interrupt
686
687 int usbnet_open (struct net_device *net)
688 {
689 struct usbnet *dev = netdev_priv(net);
690 int retval;
691 struct driver_info *info = dev->driver_info;
692
693 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
694 netif_info(dev, ifup, dev->net,
695 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
696 retval,
697 dev->udev->bus->bus_name,
698 dev->udev->devpath,
699 info->description);
700 goto done_nopm;
701 }
702
703 // put into "known safe" state
704 if (info->reset && (retval = info->reset (dev)) < 0) {
705 netif_info(dev, ifup, dev->net,
706 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
707 retval,
708 dev->udev->bus->bus_name,
709 dev->udev->devpath,
710 info->description);
711 goto done;
712 }
713
714 // insist peer be connected
715 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
716 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
717 goto done;
718 }
719
720 /* start any status interrupt transfer */
721 if (dev->interrupt) {
722 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
723 if (retval < 0) {
724 netif_err(dev, ifup, dev->net,
725 "intr submit %d\n", retval);
726 goto done;
727 }
728 }
729
730 netif_start_queue (net);
731 netif_info(dev, ifup, dev->net,
732 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
733 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
734 dev->net->mtu,
735 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
736 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
737 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
738 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
739 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
740 "simple");
741
742 // delay posting reads until we're fully open
743 tasklet_schedule (&dev->bh);
744 if (info->manage_power) {
745 retval = info->manage_power(dev, 1);
746 if (retval < 0)
747 goto done;
748 usb_autopm_put_interface(dev->intf);
749 }
750 return retval;
751
752 done:
753 usb_autopm_put_interface(dev->intf);
754 done_nopm:
755 return retval;
756 }
757 EXPORT_SYMBOL_GPL(usbnet_open);
758
759 /*-------------------------------------------------------------------------*/
760
761 /* ethtool methods; minidrivers may need to add some more, but
762 * they'll probably want to use this base set.
763 */
764
765 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
766 {
767 struct usbnet *dev = netdev_priv(net);
768
769 if (!dev->mii.mdio_read)
770 return -EOPNOTSUPP;
771
772 return mii_ethtool_gset(&dev->mii, cmd);
773 }
774 EXPORT_SYMBOL_GPL(usbnet_get_settings);
775
776 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
777 {
778 struct usbnet *dev = netdev_priv(net);
779 int retval;
780
781 if (!dev->mii.mdio_write)
782 return -EOPNOTSUPP;
783
784 retval = mii_ethtool_sset(&dev->mii, cmd);
785
786 /* link speed/duplex might have changed */
787 if (dev->driver_info->link_reset)
788 dev->driver_info->link_reset(dev);
789
790 return retval;
791
792 }
793 EXPORT_SYMBOL_GPL(usbnet_set_settings);
794
795 u32 usbnet_get_link (struct net_device *net)
796 {
797 struct usbnet *dev = netdev_priv(net);
798
799 /* If a check_connect is defined, return its result */
800 if (dev->driver_info->check_connect)
801 return dev->driver_info->check_connect (dev) == 0;
802
803 /* if the device has mii operations, use those */
804 if (dev->mii.mdio_read)
805 return mii_link_ok(&dev->mii);
806
807 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
808 return ethtool_op_get_link(net);
809 }
810 EXPORT_SYMBOL_GPL(usbnet_get_link);
811
812 int usbnet_nway_reset(struct net_device *net)
813 {
814 struct usbnet *dev = netdev_priv(net);
815
816 if (!dev->mii.mdio_write)
817 return -EOPNOTSUPP;
818
819 return mii_nway_restart(&dev->mii);
820 }
821 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
822
823 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
824 {
825 struct usbnet *dev = netdev_priv(net);
826
827 strncpy (info->driver, dev->driver_name, sizeof info->driver);
828 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
829 strncpy (info->fw_version, dev->driver_info->description,
830 sizeof info->fw_version);
831 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
832 }
833 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
834
835 u32 usbnet_get_msglevel (struct net_device *net)
836 {
837 struct usbnet *dev = netdev_priv(net);
838
839 return dev->msg_enable;
840 }
841 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
842
843 void usbnet_set_msglevel (struct net_device *net, u32 level)
844 {
845 struct usbnet *dev = netdev_priv(net);
846
847 dev->msg_enable = level;
848 }
849 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
850
851 /* drivers may override default ethtool_ops in their bind() routine */
852 static const struct ethtool_ops usbnet_ethtool_ops = {
853 .get_settings = usbnet_get_settings,
854 .set_settings = usbnet_set_settings,
855 .get_link = usbnet_get_link,
856 .nway_reset = usbnet_nway_reset,
857 .get_drvinfo = usbnet_get_drvinfo,
858 .get_msglevel = usbnet_get_msglevel,
859 .set_msglevel = usbnet_set_msglevel,
860 };
861
862 /*-------------------------------------------------------------------------*/
863
864 /* work that cannot be done in interrupt context uses keventd.
865 *
866 * NOTE: with 2.5 we could do more of this using completion callbacks,
867 * especially now that control transfers can be queued.
868 */
869 static void
870 kevent (struct work_struct *work)
871 {
872 struct usbnet *dev =
873 container_of(work, struct usbnet, kevent);
874 int status;
875
876 /* usb_clear_halt() needs a thread context */
877 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
878 unlink_urbs (dev, &dev->txq);
879 status = usb_autopm_get_interface(dev->intf);
880 if (status < 0)
881 goto fail_pipe;
882 status = usb_clear_halt (dev->udev, dev->out);
883 usb_autopm_put_interface(dev->intf);
884 if (status < 0 &&
885 status != -EPIPE &&
886 status != -ESHUTDOWN) {
887 if (netif_msg_tx_err (dev))
888 fail_pipe:
889 netdev_err(dev->net, "can't clear tx halt, status %d\n",
890 status);
891 } else {
892 clear_bit (EVENT_TX_HALT, &dev->flags);
893 if (status != -ESHUTDOWN)
894 netif_wake_queue (dev->net);
895 }
896 }
897 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
898 unlink_urbs (dev, &dev->rxq);
899 status = usb_autopm_get_interface(dev->intf);
900 if (status < 0)
901 goto fail_halt;
902 status = usb_clear_halt (dev->udev, dev->in);
903 usb_autopm_put_interface(dev->intf);
904 if (status < 0 &&
905 status != -EPIPE &&
906 status != -ESHUTDOWN) {
907 if (netif_msg_rx_err (dev))
908 fail_halt:
909 netdev_err(dev->net, "can't clear rx halt, status %d\n",
910 status);
911 } else {
912 clear_bit (EVENT_RX_HALT, &dev->flags);
913 tasklet_schedule (&dev->bh);
914 }
915 }
916
917 /* tasklet could resubmit itself forever if memory is tight */
918 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
919 struct urb *urb = NULL;
920 int resched = 1;
921
922 if (netif_running (dev->net))
923 urb = usb_alloc_urb (0, GFP_KERNEL);
924 else
925 clear_bit (EVENT_RX_MEMORY, &dev->flags);
926 if (urb != NULL) {
927 clear_bit (EVENT_RX_MEMORY, &dev->flags);
928 status = usb_autopm_get_interface(dev->intf);
929 if (status < 0)
930 goto fail_lowmem;
931 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
932 resched = 0;
933 usb_autopm_put_interface(dev->intf);
934 fail_lowmem:
935 if (resched)
936 tasklet_schedule (&dev->bh);
937 }
938 }
939
940 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
941 struct driver_info *info = dev->driver_info;
942 int retval = 0;
943
944 clear_bit (EVENT_LINK_RESET, &dev->flags);
945 status = usb_autopm_get_interface(dev->intf);
946 if (status < 0)
947 goto skip_reset;
948 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
949 usb_autopm_put_interface(dev->intf);
950 skip_reset:
951 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
952 retval,
953 dev->udev->bus->bus_name,
954 dev->udev->devpath,
955 info->description);
956 } else {
957 usb_autopm_put_interface(dev->intf);
958 }
959 }
960
961 if (dev->flags)
962 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
963 }
964
965 /*-------------------------------------------------------------------------*/
966
967 static void tx_complete (struct urb *urb)
968 {
969 struct sk_buff *skb = (struct sk_buff *) urb->context;
970 struct skb_data *entry = (struct skb_data *) skb->cb;
971 struct usbnet *dev = entry->dev;
972
973 if (urb->status == 0) {
974 dev->net->stats.tx_packets++;
975 dev->net->stats.tx_bytes += entry->length;
976 } else {
977 dev->net->stats.tx_errors++;
978
979 switch (urb->status) {
980 case -EPIPE:
981 usbnet_defer_kevent (dev, EVENT_TX_HALT);
982 break;
983
984 /* software-driven interface shutdown */
985 case -ECONNRESET: // async unlink
986 case -ESHUTDOWN: // hardware gone
987 break;
988
989 // like rx, tx gets controller i/o faults during khubd delays
990 // and so it uses the same throttling mechanism.
991 case -EPROTO:
992 case -ETIME:
993 case -EILSEQ:
994 usb_mark_last_busy(dev->udev);
995 if (!timer_pending (&dev->delay)) {
996 mod_timer (&dev->delay,
997 jiffies + THROTTLE_JIFFIES);
998 netif_dbg(dev, link, dev->net,
999 "tx throttle %d\n", urb->status);
1000 }
1001 netif_stop_queue (dev->net);
1002 break;
1003 default:
1004 netif_dbg(dev, tx_err, dev->net,
1005 "tx err %d\n", entry->urb->status);
1006 break;
1007 }
1008 }
1009
1010 usb_autopm_put_interface_async(dev->intf);
1011 urb->dev = NULL;
1012 entry->state = tx_done;
1013 defer_bh(dev, skb, &dev->txq);
1014 }
1015
1016 /*-------------------------------------------------------------------------*/
1017
1018 void usbnet_tx_timeout (struct net_device *net)
1019 {
1020 struct usbnet *dev = netdev_priv(net);
1021
1022 unlink_urbs (dev, &dev->txq);
1023 tasklet_schedule (&dev->bh);
1024
1025 }
1026 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1027
1028 /*-------------------------------------------------------------------------*/
1029
1030 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1031 struct net_device *net)
1032 {
1033 struct usbnet *dev = netdev_priv(net);
1034 int length;
1035 struct urb *urb = NULL;
1036 struct skb_data *entry;
1037 struct driver_info *info = dev->driver_info;
1038 unsigned long flags;
1039 int retval;
1040
1041 // some devices want funky USB-level framing, for
1042 // win32 driver (usually) and/or hardware quirks
1043 if (info->tx_fixup) {
1044 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1045 if (!skb) {
1046 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1047 goto drop;
1048 }
1049 }
1050 length = skb->len;
1051
1052 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1053 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1054 goto drop;
1055 }
1056
1057 entry = (struct skb_data *) skb->cb;
1058 entry->urb = urb;
1059 entry->dev = dev;
1060 entry->state = tx_start;
1061 entry->length = length;
1062
1063 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1064 skb->data, skb->len, tx_complete, skb);
1065
1066 /* don't assume the hardware handles USB_ZERO_PACKET
1067 * NOTE: strictly conforming cdc-ether devices should expect
1068 * the ZLP here, but ignore the one-byte packet.
1069 */
1070 if (length % dev->maxpacket == 0) {
1071 if (!(info->flags & FLAG_SEND_ZLP)) {
1072 urb->transfer_buffer_length++;
1073 if (skb_tailroom(skb)) {
1074 skb->data[skb->len] = 0;
1075 __skb_put(skb, 1);
1076 }
1077 } else
1078 urb->transfer_flags |= URB_ZERO_PACKET;
1079 }
1080
1081 spin_lock_irqsave(&dev->txq.lock, flags);
1082 retval = usb_autopm_get_interface_async(dev->intf);
1083 if (retval < 0) {
1084 spin_unlock_irqrestore(&dev->txq.lock, flags);
1085 goto drop;
1086 }
1087
1088 #ifdef CONFIG_PM
1089 /* if this triggers the device is still a sleep */
1090 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1091 /* transmission will be done in resume */
1092 usb_anchor_urb(urb, &dev->deferred);
1093 /* no use to process more packets */
1094 netif_stop_queue(net);
1095 spin_unlock_irqrestore(&dev->txq.lock, flags);
1096 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1097 goto deferred;
1098 }
1099 #endif
1100
1101 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1102 case -EPIPE:
1103 netif_stop_queue (net);
1104 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1105 usb_autopm_put_interface_async(dev->intf);
1106 break;
1107 default:
1108 usb_autopm_put_interface_async(dev->intf);
1109 netif_dbg(dev, tx_err, dev->net,
1110 "tx: submit urb err %d\n", retval);
1111 break;
1112 case 0:
1113 net->trans_start = jiffies;
1114 __skb_queue_tail (&dev->txq, skb);
1115 if (dev->txq.qlen >= TX_QLEN (dev))
1116 netif_stop_queue (net);
1117 }
1118 spin_unlock_irqrestore (&dev->txq.lock, flags);
1119
1120 if (retval) {
1121 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1122 drop:
1123 dev->net->stats.tx_dropped++;
1124 if (skb)
1125 dev_kfree_skb_any (skb);
1126 usb_free_urb (urb);
1127 } else
1128 netif_dbg(dev, tx_queued, dev->net,
1129 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1130 #ifdef CONFIG_PM
1131 deferred:
1132 #endif
1133 return NETDEV_TX_OK;
1134 }
1135 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1136
1137 /*-------------------------------------------------------------------------*/
1138
1139 // tasklet (work deferred from completions, in_irq) or timer
1140
1141 static void usbnet_bh (unsigned long param)
1142 {
1143 struct usbnet *dev = (struct usbnet *) param;
1144 struct sk_buff *skb;
1145 struct skb_data *entry;
1146
1147 while ((skb = skb_dequeue (&dev->done))) {
1148 entry = (struct skb_data *) skb->cb;
1149 switch (entry->state) {
1150 case rx_done:
1151 entry->state = rx_cleanup;
1152 rx_process (dev, skb);
1153 continue;
1154 case tx_done:
1155 case rx_cleanup:
1156 usb_free_urb (entry->urb);
1157 dev_kfree_skb (skb);
1158 continue;
1159 default:
1160 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1161 }
1162 }
1163
1164 // waiting for all pending urbs to complete?
1165 if (dev->wait) {
1166 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1167 wake_up (dev->wait);
1168 }
1169
1170 // or are we maybe short a few urbs?
1171 } else if (netif_running (dev->net) &&
1172 netif_device_present (dev->net) &&
1173 !timer_pending (&dev->delay) &&
1174 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1175 int temp = dev->rxq.qlen;
1176 int qlen = RX_QLEN (dev);
1177
1178 if (temp < qlen) {
1179 struct urb *urb;
1180 int i;
1181
1182 // don't refill the queue all at once
1183 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1184 urb = usb_alloc_urb (0, GFP_ATOMIC);
1185 if (urb != NULL) {
1186 if (rx_submit (dev, urb, GFP_ATOMIC) ==
1187 -ENOLINK)
1188 return;
1189 }
1190 }
1191 if (temp != dev->rxq.qlen)
1192 netif_dbg(dev, link, dev->net,
1193 "rxqlen %d --> %d\n",
1194 temp, dev->rxq.qlen);
1195 if (dev->rxq.qlen < qlen)
1196 tasklet_schedule (&dev->bh);
1197 }
1198 if (dev->txq.qlen < TX_QLEN (dev))
1199 netif_wake_queue (dev->net);
1200 }
1201 }
1202
1203
1204 /*-------------------------------------------------------------------------
1205 *
1206 * USB Device Driver support
1207 *
1208 *-------------------------------------------------------------------------*/
1209
1210 // precondition: never called in_interrupt
1211
1212 void usbnet_disconnect (struct usb_interface *intf)
1213 {
1214 struct usbnet *dev;
1215 struct usb_device *xdev;
1216 struct net_device *net;
1217
1218 dev = usb_get_intfdata(intf);
1219 usb_set_intfdata(intf, NULL);
1220 if (!dev)
1221 return;
1222
1223 xdev = interface_to_usbdev (intf);
1224
1225 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1226 intf->dev.driver->name,
1227 xdev->bus->bus_name, xdev->devpath,
1228 dev->driver_info->description);
1229
1230 net = dev->net;
1231 unregister_netdev (net);
1232
1233 /* we don't hold rtnl here ... */
1234 flush_scheduled_work ();
1235
1236 if (dev->driver_info->unbind)
1237 dev->driver_info->unbind (dev, intf);
1238
1239 free_netdev(net);
1240 usb_put_dev (xdev);
1241 }
1242 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1243
1244 static const struct net_device_ops usbnet_netdev_ops = {
1245 .ndo_open = usbnet_open,
1246 .ndo_stop = usbnet_stop,
1247 .ndo_start_xmit = usbnet_start_xmit,
1248 .ndo_tx_timeout = usbnet_tx_timeout,
1249 .ndo_change_mtu = usbnet_change_mtu,
1250 .ndo_set_mac_address = eth_mac_addr,
1251 .ndo_validate_addr = eth_validate_addr,
1252 };
1253
1254 /*-------------------------------------------------------------------------*/
1255
1256 // precondition: never called in_interrupt
1257
1258 static struct device_type wlan_type = {
1259 .name = "wlan",
1260 };
1261
1262 static struct device_type wwan_type = {
1263 .name = "wwan",
1264 };
1265
1266 int
1267 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1268 {
1269 struct usbnet *dev;
1270 struct net_device *net;
1271 struct usb_host_interface *interface;
1272 struct driver_info *info;
1273 struct usb_device *xdev;
1274 int status;
1275 const char *name;
1276 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1277
1278 /* usbnet already took usb runtime pm, so have to enable the feature
1279 * for usb interface, otherwise usb_autopm_get_interface may return
1280 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1281 */
1282 if (!driver->supports_autosuspend) {
1283 driver->supports_autosuspend = 1;
1284 pm_runtime_enable(&udev->dev);
1285 }
1286
1287 name = udev->dev.driver->name;
1288 info = (struct driver_info *) prod->driver_info;
1289 if (!info) {
1290 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1291 return -ENODEV;
1292 }
1293 xdev = interface_to_usbdev (udev);
1294 interface = udev->cur_altsetting;
1295
1296 usb_get_dev (xdev);
1297
1298 status = -ENOMEM;
1299
1300 // set up our own records
1301 net = alloc_etherdev(sizeof(*dev));
1302 if (!net) {
1303 dbg ("can't kmalloc dev");
1304 goto out;
1305 }
1306
1307 /* netdev_printk() needs this so do it as early as possible */
1308 SET_NETDEV_DEV(net, &udev->dev);
1309
1310 dev = netdev_priv(net);
1311 dev->udev = xdev;
1312 dev->intf = udev;
1313 dev->driver_info = info;
1314 dev->driver_name = name;
1315 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1316 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1317 skb_queue_head_init (&dev->rxq);
1318 skb_queue_head_init (&dev->txq);
1319 skb_queue_head_init (&dev->done);
1320 skb_queue_head_init(&dev->rxq_pause);
1321 dev->bh.func = usbnet_bh;
1322 dev->bh.data = (unsigned long) dev;
1323 INIT_WORK (&dev->kevent, kevent);
1324 init_usb_anchor(&dev->deferred);
1325 dev->delay.function = usbnet_bh;
1326 dev->delay.data = (unsigned long) dev;
1327 init_timer (&dev->delay);
1328 mutex_init (&dev->phy_mutex);
1329
1330 dev->net = net;
1331 strcpy (net->name, "usb%d");
1332 memcpy (net->dev_addr, node_id, sizeof node_id);
1333
1334 /* rx and tx sides can use different message sizes;
1335 * bind() should set rx_urb_size in that case.
1336 */
1337 dev->hard_mtu = net->mtu + net->hard_header_len;
1338
1339 net->netdev_ops = &usbnet_netdev_ops;
1340 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1341 net->ethtool_ops = &usbnet_ethtool_ops;
1342
1343 // allow device-specific bind/init procedures
1344 // NOTE net->name still not usable ...
1345 if (info->bind) {
1346 status = info->bind (dev, udev);
1347 if (status < 0)
1348 goto out1;
1349
1350 // heuristic: "usb%d" for links we know are two-host,
1351 // else "eth%d" when there's reasonable doubt. userspace
1352 // can rename the link if it knows better.
1353 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1354 (net->dev_addr [0] & 0x02) == 0)
1355 strcpy (net->name, "eth%d");
1356 /* WLAN devices should always be named "wlan%d" */
1357 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1358 strcpy(net->name, "wlan%d");
1359 /* WWAN devices should always be named "wwan%d" */
1360 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1361 strcpy(net->name, "wwan%d");
1362
1363 /* maybe the remote can't receive an Ethernet MTU */
1364 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1365 net->mtu = dev->hard_mtu - net->hard_header_len;
1366 } else if (!info->in || !info->out)
1367 status = usbnet_get_endpoints (dev, udev);
1368 else {
1369 dev->in = usb_rcvbulkpipe (xdev, info->in);
1370 dev->out = usb_sndbulkpipe (xdev, info->out);
1371 if (!(info->flags & FLAG_NO_SETINT))
1372 status = usb_set_interface (xdev,
1373 interface->desc.bInterfaceNumber,
1374 interface->desc.bAlternateSetting);
1375 else
1376 status = 0;
1377
1378 }
1379 if (status >= 0 && dev->status)
1380 status = init_status (dev, udev);
1381 if (status < 0)
1382 goto out3;
1383
1384 if (!dev->rx_urb_size)
1385 dev->rx_urb_size = dev->hard_mtu;
1386 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1387
1388 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1389 SET_NETDEV_DEVTYPE(net, &wlan_type);
1390 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1391 SET_NETDEV_DEVTYPE(net, &wwan_type);
1392
1393 status = register_netdev (net);
1394 if (status)
1395 goto out3;
1396 netif_info(dev, probe, dev->net,
1397 "register '%s' at usb-%s-%s, %s, %pM\n",
1398 udev->dev.driver->name,
1399 xdev->bus->bus_name, xdev->devpath,
1400 dev->driver_info->description,
1401 net->dev_addr);
1402
1403 // ok, it's ready to go.
1404 usb_set_intfdata (udev, dev);
1405
1406 netif_device_attach (net);
1407
1408 if (dev->driver_info->flags & FLAG_LINK_INTR)
1409 netif_carrier_off(net);
1410
1411 return 0;
1412
1413 out3:
1414 if (info->unbind)
1415 info->unbind (dev, udev);
1416 out1:
1417 free_netdev(net);
1418 out:
1419 usb_put_dev(xdev);
1420 return status;
1421 }
1422 EXPORT_SYMBOL_GPL(usbnet_probe);
1423
1424 /*-------------------------------------------------------------------------*/
1425
1426 /*
1427 * suspend the whole driver as soon as the first interface is suspended
1428 * resume only when the last interface is resumed
1429 */
1430
1431 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1432 {
1433 struct usbnet *dev = usb_get_intfdata(intf);
1434
1435 if (!dev->suspend_count++) {
1436 spin_lock_irq(&dev->txq.lock);
1437 /* don't autosuspend while transmitting */
1438 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) {
1439 spin_unlock_irq(&dev->txq.lock);
1440 return -EBUSY;
1441 } else {
1442 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1443 spin_unlock_irq(&dev->txq.lock);
1444 }
1445 /*
1446 * accelerate emptying of the rx and queues, to avoid
1447 * having everything error out.
1448 */
1449 netif_device_detach (dev->net);
1450 usbnet_terminate_urbs(dev);
1451 usb_kill_urb(dev->interrupt);
1452
1453 /*
1454 * reattach so runtime management can use and
1455 * wake the device
1456 */
1457 netif_device_attach (dev->net);
1458 }
1459 return 0;
1460 }
1461 EXPORT_SYMBOL_GPL(usbnet_suspend);
1462
1463 int usbnet_resume (struct usb_interface *intf)
1464 {
1465 struct usbnet *dev = usb_get_intfdata(intf);
1466 struct sk_buff *skb;
1467 struct urb *res;
1468 int retval;
1469
1470 if (!--dev->suspend_count) {
1471 spin_lock_irq(&dev->txq.lock);
1472 while ((res = usb_get_from_anchor(&dev->deferred))) {
1473
1474 skb = (struct sk_buff *)res->context;
1475 retval = usb_submit_urb(res, GFP_ATOMIC);
1476 if (retval < 0) {
1477 dev_kfree_skb_any(skb);
1478 usb_free_urb(res);
1479 usb_autopm_put_interface_async(dev->intf);
1480 } else {
1481 dev->net->trans_start = jiffies;
1482 __skb_queue_tail(&dev->txq, skb);
1483 }
1484 }
1485
1486 smp_mb();
1487 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1488 spin_unlock_irq(&dev->txq.lock);
1489 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1490 netif_start_queue(dev->net);
1491 tasklet_schedule (&dev->bh);
1492 }
1493 return 0;
1494 }
1495 EXPORT_SYMBOL_GPL(usbnet_resume);
1496
1497
1498 /*-------------------------------------------------------------------------*/
1499
1500 static int __init usbnet_init(void)
1501 {
1502 /* compiler should optimize this out */
1503 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb)
1504 < sizeof (struct skb_data));
1505
1506 random_ether_addr(node_id);
1507 return 0;
1508 }
1509 module_init(usbnet_init);
1510
1511 static void __exit usbnet_exit(void)
1512 {
1513 }
1514 module_exit(usbnet_exit);
1515
1516 MODULE_AUTHOR("David Brownell");
1517 MODULE_DESCRIPTION("USB network driver framework");
1518 MODULE_LICENSE("GPL");
Tomato firmware and modifications.